Would-be robber gets leveled...
 

Literally! Dude was robbing a grocery store, the owner comes up behind him with a 5 foot long carpenter's level and knocks him out cold!

http://www.nbc4.tv/news/6280142/detail.html

I'm sure there's an appropriate Looney Tunes sound effect that would work perfectly with this video.
:D
I think the one where it sounds like a wooden bat connecting with someone's skull...

*donk*

ETA - it won't let me do that in all caps. Weird.